习题 28 布尔表达式练习

>>> True and True
True
>>> False and True
False
>>> 1 == 1 and  2 == 1
False
>>> "test" == "test"
True
>>> 1 == 1 or 2 != 1
True
>>> True and 1 == 1
True
>>> False and 0 != 0
False
>>> True or 1 == 1
True
>>> "test" == "testing"
False
>>> 1 != 0 and 2 == 1
False
>>> "test" != "testing"
True
>>> "test" == 1
False
>>> not (True and False)
True
>>> not (1 == 1 and 0 != 1)
False
>>> not (10 == 1 or 1000 == 1000)
False
>>> not (1 != 10 or 3 == 4)
False
>>> not ("testing" == "testing" and "Zed" == "Cool Guy")
True
>>> 1 == 1 and not ("testing" == 1 or 1 == 0)
True
>>> "chunky" == "bacon" and not (3 == 4 or 3 == 3)
False
>>> 3 == 3 and not ("testing" == "testing" or "Python" == "Fun")
False

Python 和很多语言一样，都是返回两个被操作对象中的一个，而非它们的布尔表达式 True 或 False。

>>> "test" and "test"
'test'
>>> 1 and 1
1
>>> False and 1
False